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/*
* Functions for converting strings to numbers.
*
* Copyright 2012 Andrew Wood, distributed under the Artistic License 2.0.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
/*
* This function is used instead of the macro from <ctype.h> because
* including <ctype.h> causes weird versioned glibc dependencies on certain
* Red Hat systems, complicating package management.
*/
static int pv__isdigit(char c)
{
return ((c >= '0') && (c <= '9'));
}
/*
* Return the numeric value of "str", as a long long.
*/
long long pv_getnum_ll(char *str)
{
long long n = 0;
long long decimal = 0;
int decdivisor = 1;
int shift = 0;
while (str[0] != 0 && (!pv__isdigit(str[0])))
str++;
for (; pv__isdigit(str[0]); str++) {
n = n * 10;
n += (str[0] - '0');
}
/*
* If a decimal value was given, skip the decimal part.
*/
if ((str[0] == '.') || (str[0] == ',')) {
str++;
for (; pv__isdigit(str[0]); str++) {
if (decdivisor < 10000) {
decimal = decimal * 10;
decimal += (str[0] - '0');
decdivisor = decdivisor * 10;
}
}
}
/*
* Parse any units given (K=KiB=*1024, M=MiB=1024KiB, G=GiB=1024MiB,
* T=TiB=1024GiB).
*/
if (str[0]) {
while ((str[0] == ' ') || (str[0] == '\t'))
str++;
switch (str[0]) {
case 'k':
case 'K':
shift = 10;
break;
case 'm':
case 'M':
shift = 20;
break;
case 'g':
case 'G':
shift = 30;
break;
case 't':
case 'T':
shift = 40;
break;
default:
break;
}
}
/*
* Binary left-shift the supplied number by "shift" times, i.e.
* apply the given units (KiB, MiB, etc) to it, but never shift left
* more than 30 at a time to avoid overflows.
*/
while (shift > 0) {
int shiftby;
shiftby = shift;
if (shiftby > 30)
shiftby = 30;
n = n << shiftby;
decimal = decimal << shiftby;
shift -= shiftby;
}
/*
* Add any decimal component.
*/
decimal = decimal / decdivisor;
n += decimal;
return n;
}
/*
* Return the numeric value of "str", as a double.
*/
double pv_getnum_d(char *str)
{
double n = 0.0;
double step = 1;
while (str[0] != 0 && (!pv__isdigit(str[0])))
str++;
for (; pv__isdigit(str[0]); str++) {
n = n * 10;
n += (str[0] - '0');
}
if ((str[0] != '.') && (str[0] != ','))
return n;
str++;
for (; pv__isdigit(str[0]) && step < 1000000; str++) {
step = step * 10;
n += (str[0] - '0') / step;
}
return n;
}
/*
* Return the numeric value of "str", as an int.
*/
int pv_getnum_i(char *str)
{
return (int) pv_getnum_ll(str);
}
/*
* Return nonzero if the given string is not a valid integer (type=0) or
* double (type=1).
*/
int pv_getnum_check(char *str, int type)
{
if (!str)
return 1;
while ((str[0] == ' ') || (str[0] == '\t'))
str++;
if (!pv__isdigit(str[0]))
return 1;
for (; pv__isdigit(str[0]); str++);
if (str[0] == '.') {
if (type == 0)
return 1;
str++;
for (; pv__isdigit(str[0]); str++);
}
if (str[0] == 0)
return 0;
/*
* Suffixes are not allowed for doubles, only for integers.
*/
if (type == 1)
return 1;
while ((str[0] == ' ') || (str[0] == '\t'))
str++;
switch (str[0]) {
case 'k':
case 'K':
case 'm':
case 'M':
case 'g':
case 'G':
case 't':
case 'T':
str++;
break;
default:
return 1;
}
if (str[0])
return 1;
return 0;
}
/* EOF */
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